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4th August 2009, 09:37 PM  #21  
diyAudio Member

Quote:
Are current conveyors available as ICs?
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4th August 2009, 09:46 PM  #22 
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4th August 2009, 10:01 PM  #23 
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Join Date: Jun 2004
Location: Warsaw

Actually i am not concious of any current convoyour IC.
edit: maybe you may use a current feedback amplifier with noninverting input grouded As for opamp stability, no opamp likes voltage gain below one, especially fast video opamps. A capacitor in feedback loop is often mandatory. I suggest you studdied circuits designed for fast photodiode amplifiers, they serve the same purpose which is converting current to voltage and there is much research there, for example on how to tailor feedback capacitor for macimum gain*bandwidth. 
4th August 2009, 10:08 PM  #24 
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Join Date: Apr 2005
Location: Stockholm

Wavebourn,
just like in audio, overall negative feedback is really a nuisance here. 
4th August 2009, 10:58 PM  #25  
diyAudio Member

Quote:
The first one is a current to voltage converter, with close to zero input resistance to prevent crosstalk between signals I measure. The second one, is a maximumpossiblegain amp with logarythmic overdrive function; the 3'd one has a positive feedback, a flipflop with well defined hysteresis to shape output and prevent oscillations. Do you know what are you talking about, Lumba?
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The Devil is not so terrible as his math model! 

5th August 2009, 06:06 AM  #26 
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Join Date: Apr 2002
Location: Prague

'Which overall negative feedback?'
That in the 1st opamp e.g., the I/V converter. The FB ratio is defined by Zol/R1 
5th August 2009, 07:35 AM  #27  
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Quote:
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The Devil is not so terrible as his math model! 

5th August 2009, 07:38 AM  #28  
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Quote:
Thanks!
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5th August 2009, 07:58 AM  #29 
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Join Date: Dec 2002
Location: Sydney, Australia

What you specified you want in the first post and what you are drawing don't seem to relate.
What exactly is the function required? 
5th August 2009, 08:12 AM  #30 
diyAudio Member

I need to compare 2 currents when they flow in different directions, if to say strictly. Both may swing between 20 mA to +20 mA, up to 1 MHz frequency.
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The Devil is not so terrible as his math model! 
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